Trailer with rotatable ball head

The utility model belongs to the technical field of vehicle traction, and particularly relates to a trailer device with a rotatable ball head, which comprises a trailer main body and a trailer assembly arranged on the trailer main body, the trailer assembly comprises a connecting piece and a trailer piece, one end of the connecting piece is connected with the trailer main body, and a rotating shaft is formed at the other end of the connecting piece. The trailer device is simple in structure and convenient to use, the trailer ball heads at different angles can be selected during trailer, a plurality of trailer ball heads can be selected to be used at the same time, and the trailer device is simple in structure, convenient to use and high in practicability. According to the utility model, only the fixing screw needs to be screwed off, then the trailer piece is held to rotate around the rotating shaft to a proper position, and then the fixing screw is screwed back for fixation, so that the position adjustment is